First D.5 sub-phase: ship gmToolbarUI as the first data-driven game panel (18 slots from LayoutDesc 0x21000016, populated from the persisted PlayerDescription shortcuts, real composited icons, click-to-use). Minimal scope; faithful CPU icon pre-composite (IconData::RenderIcons port). Five bounded units: UiItemSlot, UiItemList, IconComposer, CreateObject IconId extension, ToolbarController. Roadmap registration of D.5.1 is plan step 0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
